This may be a stupid question, but do you put on lights (head/rear) for your TT bike? Or because TT are so specific and the training you do on them are very specific and to be done during the day, you never needed lights?

If you do use lights, are there anything I should be aware of? I'm looking at roadie lights, but because my seat tube (Ordu TT bike) is sooo thick, like many other TT bikes, will an ordinary rear light be able to mount on the back, or do we need something specific?